Question

1.Electrical energy can be generated directly by using the principal of electromagnetic induction.
2.Solar photovoltaic cells converts the electrical energy into mechanical energy.​

Answer 1

Answer:

(a) False

An electric motor converts electrical energy into mechanical energy. As the current carrying coil is placed in a magnetic field, it experiences a force due to which it starts rotating.

(b) True

An electric generator works on the principle of electromagnetic induction. When the coil is rotated by external mechanical forces in a magnetic field, the magnetic flux through the coil changes. This creates an induced emf in the coil and hence induced current flows.

(c) True

The field at the centre of a long solenoid carrying current will be parallel straight lines. This can also be verified by Right-hand thumb rule.

(d) False

Live wire has red insulation cover, whereas earth wire has green insulation colour in the domestic circuits.